What is your definition of being successful?
I suspect that your teacher would like for you to consider what makes a person successful. Each person must have his own measuring stick for his own feeling of having lived a successful life.
This is what Ralph Waldo Emerson said about success.
" To laugh often and much
To win the respect of intelligent people and affection of children
To earn the appreciation of honest critics and endure the betrayal of false friends
To appreciate beauty
To find the best in others
To leave the world a bit better, whether by a healthy child, a garden patch or a redeemed social condition
To know even one life has breathed easier because you have lived. "